Connection structure and terminal block

Abstract

A connection structure is a connection structure for connecting a conductive bus bar (10) to a connection target. A connection structure (100) is provided with: a connection section (18) that is provided to a bus bar (10) and serves as a connection site to a connection target; and a holder (30) configured to accommodate foreign matter generated in the connection portion (18). The connection portion (18) includes a threaded fastening portion (A) between a bolt (16) and a nut (17), the bolt (16) extending in the plate thickness direction of the bus bar (10), and the bolt (16) being screwed into the nut (17). In the holder (30), a maze structure (38) is formed by a plurality of spaces for accommodating foreign matters, i.e., a first concave part (36) and a second concave part (37), and partition parts for partitioning the plurality of spaces, i.e., a first partition part (P1) and a second partition part (P2).

Description

Technical Field

[0001] The invention relates to a connection structure and a terminal block. Background Art

[0002] Generally, a connection structure for fastening a busbar connected to an electronic component to a terminal of an external connector is known (for example, see Patent Document 1). In the terminal connection structure described in Patent Document 1, a busbar accommodated in a storage case is fastened to a connector terminal inserted into the storage case from the outside by bolts.

[0003] Prior art

[0004] Patent Literature

[0005] Patent Document 1: JP2011187933A Summary of the invention

[0006] Problems to be solved by the present invention

[0007] In the above-mentioned terminal block, foreign matters such as wear debris are generated in the portion where the bolt is fastened, and the foreign matters may cause a problem that they are scattered inside the storage case.

[0008] An object of the present invention is to provide a connection structure and a terminal block capable of reducing the scattering of foreign matter.

[0009] Technical Solution

[0010] In order to solve the above-mentioned problems and achieve the purpose, a connection structure for connecting a conductive busbar to a connection target includes: a connection portion, which is arranged on the busbar and serves as a connection portion for the connection target; and an anti-scattering portion, which is constructed to accommodate foreign matter generated in the connection portion, wherein the connection portion includes a threaded fastening portion between a fastening component and a fastening matching component, wherein the fastening component extends in the plate thickness direction of the busbar, and the fastening matching component is provided for the fastening component to be screwed in, and wherein, in the anti-scattering portion, a plurality of spaces constructed to accommodate the foreign matter and a partition separating the plurality of spaces constitute a maze structure.

[0011] The terminal block includes the above-mentioned connection structure.

[0012] Beneficial effects of the present invention

[0013] According to the present disclosure, it is possible to provide a connection structure and a terminal block capable of reducing scattering of foreign matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is an exploded perspective view of a terminal block having a connection structure.

[0015] Figure 2 This is a three-dimensional view of the terminal block after it is assembled.

[0016] Figure 3 is along Figure 2 A cross-sectional view taken along line AA in FIG.

[0017] Figure 4 It is an enlarged perspective view of a retaining member constituting the connection structure.

[0018] Reference Mark List

[0019] A Threaded fastening part

[0020] P1 first partition (partition)

[0021] P2 Second partition (partition)

[0022] 10 Bus Bar

[0023] 16 bolts (fastening parts)

[0024] 17 Nut (fastening the mating part)

[0025] 18Connection

[0026] 30 retainer (anti-scattering part)

[0027] 36 first recess (space)

[0028] 37 second recess (space)

[0029] 38 Maze Structure

[0030] 100 Connection structure DETAILED DESCRIPTION

[0031] Now refer to Figures 1 to 4 Describe an embodiment of the present invention. In the present embodiment, in the accompanying drawings, arrows X, Y and Z represent directions perpendicular to each other. The central axis direction of the second insertion hole 15 (insertion hole) in the housing 20 (described later), that is, the axial direction is identified by arrow Z and is referred to as the "upper and lower directions Z". One side of the upper and lower directions Z is referred to as the "upper side Z1", and the other side is referred to as the "lower side Z2". The front-to-back direction of the housing 20 is referred to as the "front-to-back direction X (orthogonal direction)", and one side of the front-to-back direction X is referred to as the "front side X1", and the other side is referred to as the "rear side X2". The width direction of the housing 20 is referred to as the "left-right direction Y (orthogonal direction)", and one side of the left-to-right direction Y is referred to as the "left side Y1", and the other side is referred to as the "right side Y2". The definitions of these directions are only for the convenience of explanation and do not limit the directions of the terminal block 1 during manufacturing and use. In addition, in order to avoid complication, some reference numerals are omitted for components that are provided with a plurality of similar structures, such as the bus bar 10, the mounting recess 28, the receiving portion 32, etc. described later.

[0032] The terminal block 1 according to the present embodiment is a connector that is attached to an electrical device and connects one electrical device (e.g., a battery) mounted on a vehicle such as an electric car with another electrical device (e.g., an inverter) as a connection target. Figure 1 and Figure 2 As shown, the terminal block 1 includes a bus bar 10 and a housing 20 that holds the bus bar 10. The bus bar 10 is formed into a plate shape using a conductive metal material, and in the present embodiment, three bus bars 10 are arranged side by side in the left-right direction Y. The bus bar 10 includes a vertical plate portion 11 extending in the up-down direction Z, and is formed with a first connection hole 12 that penetrates the lower end portion of the vertical plate portion 11 in the front-back direction X. A bolt member (not shown) is inserted into the first connection hole 12, and the bus bar 10 is connected to a terminal of an electric wire connected to one of the electrical devices serving as the above-mentioned connection target, etc., via the bolt member.

[0033] The upper end portion of the vertical plate portion 11 is bent toward the front side X1 to form a bent portion 13, and the horizontal plate portion 14 extending toward the front side X1 is continuous with the end of the bent portion 13. A second insertion hole 15 (insertion hole) is formed in the horizontal plate portion 14, penetrating in the up-down direction Z (i.e., the plate thickness direction). The second insertion hole 15 serves as a connection portion for the end of an electric wire connected to another of the above-mentioned electric devices serving as connection targets, and constitutes a connection portion in the present embodiment so that a bolt 16 (see FIG. 1 ) serving as a fastening member described below can be connected. Figure 3 ) can be inserted. Figure 3 As shown, the bolt 16 has a head 16a arranged on the upper side Z1 (one side in the axial direction) of the bus bar 10 and a male thread portion 16b inserted into the second insertion hole 15 and extending in the up-down direction Z. In the present embodiment, the bolt 16 is composed of the head 16a and the male thread portion 16b, but the present invention is not limited thereto, and a flange bolt having a flange portion protruding outward in the radial direction between the head 16a and the male thread portion 16b may also be used.

[0034] A nut 17 serving as a fastening counterpart is arranged on the lower end side of the male threaded portion 16b. The nut 17 has a substantially rectangular parallelepiped shape, and the lower end of the male threaded portion 16b is screwed into the female threaded portion 17a formed in the central portion. In the present embodiment, the screwed portion of the male threaded portion 16b and the female threaded portion 17a constitutes a threaded fastening portion A. By means of the bolt 16 and the nut 17 constructed in this manner, for example, a round terminal of an electric wire to be connected to an electrical device can be connected to the busbar 10. The above-mentioned second insertion hole 15 and the threaded fastening portion A constitute the connecting portion 18 of the present embodiment.

[0035] The housing 20 is formed using a resin material. The housing 20 includes: a support portion 21 that covers the outer surface of the vertical plate portion 11 of the busbar 10; and a plate-shaped main body portion 22 that extends in the front-to-rear direction X and the left-to-right direction Y at the upper end of the support portion 21. The support portion 21 is formed into a cylindrical shape extending in the up-down direction Z. The three busbars 10 are inserted into the support portion 21 in the up-down direction Z and are fixed in a state where their outer surfaces are covered. Various structures can be used to fix the busbar 10. For example, a through hole (not shown) can be formed in the support portion 21, and the busbar 10 can be inserted into the through hole and then fixed, or the busbar 10 and the support portion 21 can be integrated by molding. The retainer accommodating portion 23 is formed on the top surface of the main body portion 22 and opens to the upper side Z1 and the front side X1 (one side in the orthogonal direction).

[0036] Three retainer accommodating portions 23 are formed corresponding to the number of bus bars 10, and the three retainer accommodating portions 23 are arranged in the left-right direction Y, and a retainer 30 (anti-scattering portion) described later is accommodated in the retainer accommodating portion 23. A nut accommodating portion 24 is formed in the upper edge portion of the retainer accommodating portion 23. The nut accommodating portion 24 has a side wall 25 that rises from the upper edge portion of the retainer accommodating portion 23 toward the upper side Z1, and similarly to the retainer accommodating portion 23, is open to the upper side Z1 and the front side X1. The nut accommodating portion 24 accommodates the nut 17. A first support protrusion 26 that protrudes inward in the left-right direction Y is formed at the lower end portion of the inner surface of the side wall 25 located on the left side Y1 and the right side Y2 in the side wall 25 of the nut accommodating portion 24.

[0037] The first support protrusion 26 abuts against the lower side of the nut 17 and supports the nut 17 toward the upper side Z1. In addition, a second support protrusion 27 is formed at the central portion of the inner surface of the side wall 25 located on the left side Y1 and the right side Y2, protruding inward in the left-right direction Y. The second support protrusion 27 abuts against the side surface of the nut 17 and restricts the displacement of the nut 17 in the left-right direction Y. The retainer accommodating portion 23 and the nut accommodating portion 24 formed in this way constitute a mounting recess 28 that opens to the front side X1 of the housing 20. The nut 17 is accommodated in the upper side Z1 of the mounting recess 28, and the retainer 30 is accommodated in the lower side Z2 of the mounting recess 28.

[0038] The retainer 30 is a scattering prevention portion of the present embodiment, which prevents foreign matter from scattering into the housing 20 by accommodating foreign matter generated in the above-mentioned connection portion 18 (the second insertion hole 15 and the screw fastening portion A), and is formed using a resin material and is detachably attached to the mounting recess 28. Figure 4As shown, the holder 30 has a plate-shaped shielding portion 31 extending in the left-right direction Y and the up-down direction Z. The shielding portion 31 is a portion that shields the opening of the front side X1 of the above-mentioned mounting recess 28, and its size in the up-down direction Z is formed to be substantially the same as the size of the mounting recess 28 in the up-down direction Z. A receiving portion 32 protruding toward the rear side X2 is formed on the surface of the shielding portion 31 facing the rear side X2. The receiving portion 32 is a portion accommodated in the holder accommodating portion 23 of the mounting recess 28, and three receiving portions 32 are formed to match the number of mounting recesses 28, and the three receiving portions 32 are arranged at intervals in the left-right direction Y.

[0039] The receiving portion 32 includes a bottom plate 33 in a substantially rectangular plate shape, a frame portion 34 rising from the edge of the bottom plate 33 toward the upper side Z1, and a cylinder portion 35 provided at the center of the bottom plate 33. In the present embodiment, the cylinder portion 35 is formed in a cylindrical shape, extends toward the upper side Z1, and opens toward the upper side Z1. Figure 3 As shown, when the receiving portion 32 is accommodated in the retainer accommodating portion 23 and the nut 17 is accommodated in the nut accommodating portion 24, the central axis of the barrel 35 is coaxial with the central axis of the second insertion hole 15 and the central axis of the nut 17. In this state, the interior of the barrel 35 is arranged at least on the lower side Z2 of the threaded fastening portion A and is open toward the connecting portion 18, and the interior of the barrel 35 constitutes the first recess 36 (space) of the present embodiment. In addition, in the receiving portion 32, the area between the outer surface of the barrel 35 and the inner surface of the frame portion 34 covers the first recess 36 around the central axis (axis) of the threaded fastening portion A, and similarly to the first recess 36, is open toward the connecting portion 18, constituting a second recess 37 (space) according to the present embodiment.

[0040] like Figure 4 As shown, on the surface of the shielding portion 31 facing the rear side X2, a connecting portion 39 protruding toward the rear side X2 is formed between the receiving portion 32 and the receiving portion 32. A total of two connecting portions 39 are formed, and the two connecting portions 39 are parts that fix the retaining member 30 installed in the mounting recess 28 to the housing 20, and are arranged in the left-right direction Y. The connecting portion 39 includes a connecting body 39a and an insertion piece 39b extending from the rear end of the connecting body 39a to the rear side X2. The connecting body main body 39a is formed into a roughly rectangular rod shape and extends to the rear side X2. When the retaining member 30 is installed in the mounting recess 28, the connecting body 39a is clamped in the left-right direction Y by the side wall 25 of the nut accommodating portion 24 to limit its displacement in the left-right direction Y. The insertion piece 39b is formed into a plate shape, extends to the rear side X2, and is inserted into the through hole 19 (see Figure 3 ). The claw portion 39c is formed at the rear end portion of the insertion piece 39b and protrudes toward the lower side Z2. The claw portion 39c serves as a stopper that prevents the insertion piece 39b from coming out of the through hole.

[0041] With such a configuration, when the retainer 30 is installed in the mounting recess 28, as described above, the central axis of the second insertion hole 15, the central axis of the nut 17, and the central axis of the barrel 35 are coaxial. Then, the first recess 36 and the second recess 37 are opened toward the connecting portion 18. Figure 3 As shown, when viewed from the front side X1, the shielding portion 31 overlaps with the opening on the front side X1 of the mounting recess 28. That is, the shielding portion 31 shields the opening of the mounting recess 28. Furthermore, with this configuration, even if foreign matter such as wear debris generated in the connecting portion 18 is scattered to the lower side Z2, the foreign matter falls into the first recess 36 and is accommodated in the first recess 36, thereby preventing the foreign matter from being scattered.

[0042] Furthermore, if foreign matter received in the first recess 36 is scattered to the outside of the first recess 36 by flying up or the like, the second recess 37 covering the first recess 36 receives the foreign matter, thereby preventing it from being scattered. Furthermore, by forming the first recess 36 and the second recess 37, foreign matter that is scattered from the connection portion 18 and is not received in the first recess 36 can be directly received in the second recess 37. Furthermore, even if the foreign matter received in the second recess 37 is scattered to the outside of the second recess 37 by flying up or the like, the foreign matter can be received in the first recess 36. In other words, the retainer 30 has a plurality of spaces to receive foreign matter, and prevents the foreign matter from being scattered in two stages, namely, in the first recess 36 and the second recess 37.

[0043] The boundary between the first recess 36 and the second recess 37 constitutes a first partition P1 (partition) that separates the above-mentioned multiple spaces. The boundary between the second recess 37 and the outside of the retaining member 30 constitutes a second partition P2 (partition) that separates the above-mentioned multiple spaces. By establishing the first partition P1 and the second partition P2, the imaginary scattering path of foreign matter becomes a complex scattering path that crosses the first partition P1 and the second partition P2. As a result, when foreign matter passes through the first partition P1 and the second partition P2, the rate of scattering of the foreign matter slows down, thereby suppressing the scattering of the foreign matter. In the present embodiment, the first recess 36 and the second recess 37 (multiple spaces for accommodating foreign matter) and the first partition P1 and the second partition P2 (partition) that separate the multiple spaces are collectively referred to as a maze structure 38.

[0044] In order to reliably accommodate foreign matter that may be generated in the connection portion 18, the opening area of ​​the first recess 36 is preferably formed to be larger than the opening area of ​​the nut 17. In addition, it is preferred that the dimension of the second recess 37 from the end on the left side Y1 to the end on the right side Y2 and the dimension from the end on the front side X1 to the end on the rear side X2, that is, the dimension in the orthogonal direction orthogonal to the up-down direction Z, be set to be larger than the dimension of the nut 17 in the same direction.

[0045] The connection portion 18 and the retaining member 30 constructed as described above constitute a connection structure 100 that connects the busbar 10 to a connection target. Specifically, the connection structure 100 is a connection structure that connects the conductive busbar 10 to a connection target, and includes a connection portion 18 that is provided on the busbar 10 and serves as a connection portion of the connection target. The connection structure 100 also includes a retaining member 30 that is configured to accommodate foreign matter generated in the connection portion 18. The connection portion 18 includes a threaded fastening portion A between a bolt 16 and a nut 17. The retaining member 30 has: a plurality of spaces for accommodating foreign matter, namely a first recess 36 and a second recess 37; and a partition that separates the plurality of spaces, namely a first partition P1 and a second partition P2. The first recess 36, the second recess 37, the first partition P1, and the second partition P2 constitute a labyrinth structure 38.

[0046] Next, refer to Figure 1 and Figure 2 Assembly of the terminal block 1 will be described. Figure 1 It is an exploded perspective view of a terminal block 1 having a connection structure 100 . Figure 2 : is a stereoscopic view of the terminal block 1 after assembly. First, the busbar 10 is formed into one piece with the housing 20 by molding. Then, the nut 17 is installed in the nut receiving portion 24 of each mounting recess 28. Next, the retainer 30 is prepared and positioned so that the end of the rear side X2 of the receiving portion 32 faces the opening of the retainer receiving portion 23 of the mounting recess 28 of the housing 20 in the front-to-back direction X. Then, in this state, the retainer 30 is slid to the rear side X2 and assembled into the retainer receiving portion 23. At this time, the receiving portion 32 is inserted into each retainer receiving portion 23. At this time, the connecting body 39a of the connecting portion 39 is inserted between the side wall 25 of one nut receiving portion 24 and the side wall 25 of another nut receiving portion 24. In addition, the insertion piece 39b of each connecting portion 39 is inserted into the corresponding through hole 19 of the housing 20. Then, when the central axes of the second insertion hole 15 , the nut 17 , and the cylindrical portion 35 are coaxial, the assembly of the holder 30 is completed.

[0047] like Figure 2As shown, this completes the assembly of the terminal block 1. In such a state of the terminal block 1, the horizontal plate portion 14 of the busbar 10 is connected and fixed to the connection target by screwing the bolt 16 and the nut 17 together. In this process, foreign matter such as wear debris may be generated in the threaded fastening portion A. However, as described above, the provision of the labyrinth structure 38 prevents the scattering of foreign matter. Note that, unlike the present embodiment, for example, it is also possible to consider closing the opening by crimping a component such as a cover to the opening of each nut 17 on the opposite side of the bolt 16 to reduce the scattering of wear debris. However, in this case, a dedicated crimping machine is required, and three nuts 17 and three covers, a total of six components, are required, which makes it troublesome to manufacture the terminal block 1. In contrast, according to the present embodiment, by preparing only one retainer 30, the scattering of foreign matter generated by the three nuts 17 can be reduced. In addition, as described above, by inserting the retainer 30 into the retainer accommodating portion 23, the retainer 30 can be assembled to the housing 20, so no special equipment or the like is required for assembly. Therefore, the number of components of the terminal block 1 can be reduced, and the manufacturing cost of the terminal block 1 can be reduced.

[0048] According to the above-described embodiment, by providing a labyrinth structure 38 in the retaining member 30 (anti-scattering portion), foreign matter such as wear debris scattered from the connecting portion 18 (such as the threaded fastening portion A) can be accommodated in the first recess 36 (space). In addition, by means of the labyrinth structure 38, foreign matter scattered around the first recess 36 can be accommodated in the second recess 37 (space). This structure can prevent the scattering of foreign matter in two stages. In addition, by means of the labyrinth structure 38, the imaginary scattering path of the foreign matter can be made into a complex scattering path spanning the first partition P1 and the second partition P2 (partitions). Therefore, the first partition P1 and the second partition P2 can slow down the scattering rate of foreign matter and reduce the scattering of foreign matter. Therefore, it is possible to provide a connection structure 100 that can reduce the scattering of foreign matter.

[0049] In addition, according to the above embodiment, in the structure in which the busbar 10 is sandwiched between the head 16a of the bolt 16 and the nut 17 in the plate thickness direction, the scattering of foreign matter can be reduced by the retaining member 30 (anti-scattering portion) located on the lower side Z2 (the other side in the axial direction) of the nut 17.

[0050] Furthermore, according to the above-described embodiment, since the opening area of ​​the first recess 36 is larger than the opening area of ​​the nut 17, foreign matter falling from the female thread portion 17a of the nut 17 can be reliably accommodated in the first recess 36. Furthermore, the dimensions of the second recess 37 in the front-rear direction X and the left-right direction Y (orthogonal direction) are set to be larger than the dimensions of the nut 17 in the front-rear direction X and the left-right direction Y (orthogonal direction). Due to this arrangement, even if there are foreign matters that cannot be accommodated in the first recess 36, these foreign matters can be reliably accommodated in the lower side Z2 of the nut 17. This further prevents the scattering of foreign matters.

[0051] According to the above-described embodiment, the terminal block 1 can be configured using the connection structure 100 capable of alleviating scattering of foreign matter.

[0052] Furthermore, according to the above-described embodiment, by accommodating the nut 17 and the retainer 30 in the mounting recess 28 of the housing 20, it is possible to prevent foreign matter from being scattered. In this case, when viewed from the front side X1 (one side in the orthogonal direction), the shielding portion 31 of the retainer 30 overlaps with the opening of the front side X1 of the mounting recess 28, so that the opening area of ​​the opening is 0 at the maximum. Therefore, it is possible to prevent foreign matter from being scattered from the opening of the mounting recess 28.

[0053] The embodiments of the terminal block 1 and the connection structure 100 are described in detail above with reference to the drawings. However, the specific configuration is not limited thereto, and the present invention includes design changes and the like that do not deviate from the gist of the present invention.

[0054] For example, in the present embodiment, a first recess 36 formed inside the cylindrical 35 and a second recess 37 formed between the outer surface of the cylindrical 35 and the inner surface of the frame portion 34 constitute a plurality of spaces. The first partition P1 and the second partition P2 constitute a partition. The space and the partition constitute a labyrinth structure 38. However, the structure of the labyrinth structure 38 is not limited thereto. That is, as long as there are a plurality of spaces for accommodating foreign matter and a partition for separating the plurality of spaces, the shape and number of the spaces can be appropriately changed. In the present embodiment, the threaded fastening portion A is constituted by the male thread portion 16b of the bolt 16 and the female thread portion 17a of the nut 17, but the structure of the threaded fastening portion A is not limited thereto. For example, a female thread portion may be formed on the inner circumferential surface of the second insertion hole 15, and the female thread portion and the male thread portion 16b may constitute the threaded fastening portion A. In addition, the nut 17 is independent of the housing 20, but the nut 17 may be provided integrally with the housing 20. Similarly, the bolt 16 may be provided integrally with the housing 20.

[0055] Furthermore, in the present embodiment, the shielding portion 31 is provided on the retaining member 30, and the dimension of the shielding portion 31 in the up-down direction Z is set to be substantially the same as the dimension of the mounting recess 28 in the up-down direction Z. However, the dimension of the shielding portion 31 in the up-down direction Z can be appropriately changed. Furthermore, the shielding portion 31 itself can be omitted. The connection structure 100 of the present embodiment is not limited to the terminal block 1, and can be applied to various configurations including the connection portion 18 that connects the bus bar 10 to the connection target, and can achieve the same effects and advantages as those of the present embodiment.

Claims

1. A connection structure for connecting a conductive bus bar to a connection target, comprising: a connection portion provided on the bus bar and serving as a connection site for the connection target; as well as an anti-scattering portion configured to receive foreign matter generated in the connecting portion, The connection portion includes a threaded fastening portion between a fastening component and a fastening counterpart component, wherein the fastening component extends in the plate thickness direction of the busbar and the fastening counterpart component is threaded into the fastening component, and In the scattering prevention portion, a plurality of spaces configured to accommodate the foreign matter and a partition portion that partitions the plurality of spaces form a labyrinth structure.

2. The connection structure according to claim 1, in, The maze structure comprises: a first recessed portion disposed at least on the other side of the threaded fastening portion in the axial direction and opening toward the connecting portion; and a second recessed portion, which covers the first recessed portion around the axis of the threaded fastening portion and opens toward the connecting portion, wherein the interior of the first recess and the interior of the second recess constitute the space, and The boundary between the first recessed portion and the second recessed portion constitutes the partition.

3. The connection structure according to claim 2, wherein: The connecting portion includes an insertion hole that penetrates the bus bar in the plate thickness direction. The fastening component is a bolt, and the bolt comprises: a head portion, the head portion being arranged at one side in the axial direction relative to the bus bar; and a male thread portion configured to be inserted into the insertion hole, The fastening counterpart is a nut, which is arranged on the other side of the busbar in the axial direction and includes a female thread portion into which the male thread portion is screwed, The male thread portion and the female thread portion constitute the thread fastening portion, and The scatter prevention portion is arranged closer to the other side in the axis direction than the nut.

4. The connection structure according to claim 3, wherein: The plate thickness direction is the up-down direction, One side in the axis direction is the upper side, The other side in the axis direction is the lower side, The opening area of ​​the first recess is larger than the opening area of ​​the nut, and A dimension of the second recess in a direction perpendicular to the axial direction is larger than a dimension of the nut in the direction perpendicular to the axial direction. 5 . A terminal block comprising the connection structure according to claim 4 .

6. The terminal block according to claim 5, comprising a housing configured to hold the bus bar, in, The housing is provided with a mounting recess, which is open to one side in the orthogonal direction. The nut is accommodated on the upper side of the mounting recess, The anti-scattering portion is accommodated at the lower side of the mounting recess, and The scattering prevention portion is provided with a shielding portion that overlaps with an opening of the mounting recess when viewed from one side in the orthogonal direction.

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